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Synthesis 1991; 1991(1): 21-23
DOI: 10.1055/s-1991-26368
DOI: 10.1055/s-1991-26368
paper
© Georg Thieme Verlag, Rüdigerstr. 14, 70469 Stuttgart, Germany. All rights reserved. This journal, including all individual contributions and illustrations published therein, is legally protected by copyright for the duration of the copyright period. Any use, exploitation or commercialization outside the narrow limits set by copyright legislation, without the publisher's consent, is illegal and liable to criminal prosecution. This applies in particular to photostat reproduction, copying, cyclostyling, mimeographing or duplication of any kind, translating, preparation of microfilms, and electronic data processing and storage.
A Novel and Efficient Synthesis of 4H-3,1-Benzoxazines by a Tandem Aza-Wittig/Heterocumulene-Mediated Annulation Strategy
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Publikationsdatum:
17. September 2002 (online)
![](https://www.thieme-connect.de/media/synthesis/199101/lookinside/thumbnails/10.1055-s-1991-26368-1.jpg)
2-[(Triphenylphosphoranylidene)amino]benzyl alcohol 2 reacts with isocyanates or isothiocyanates in refluxing toluene to give the corresponding 2-alkyl(aryl)amino-4H-3,1-benzoxazines 5. Iminophosphorane 2 also reacts with carbon dioxide and carbon disulfide to give 4H-3,1-benzoxazin-2(1H)-one (6) and -thione (7), respectively.